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2-4 Suite56™ Parallel Port Command Converter User’s Manual Motorola

Resetting Target DSP Devices

Figure 2-4 shows two possible configurations of a second method that also enables signal

quality to meet the requirements. In Configuration Number 1, the signal is split and

buffered into a number of parallel TCKn signals. Each of these signals may drive up to

four TCK inputs.

Figure 2-4. Multiple JTAG Connectors (Parallel Method)

In Configuration Number 2, the signal is split and buffered into a number of parallel

TMSn signals. Each of these signals may drive up to four TMS inputs.

Each method is equally valid. The choice of methods will depend on practical

considerations related to each project.

2.4 Resetting Target DSP Devices

The RESET

signal and TRST signals from the command converter are typically connected

to all target DSP devices on a JTAG chain. All DSP devices on a JTAG chain connected to

a specific command converter device are reset when R

ESET and TRST are asserted by the

debugger command FORCE R. Execution control is established immediately after

TCK TCK TCK TCK

TCK TCK TCK

TCK TCK TCK TCK

TCK TCK

TCK

AA2040

TMS TMS TMS TMS

TMS TMS TMS

TMS TMS TMS TMS

TMS TMS

TMS

Configuration Number 1 —Fan Out of TCK at Source

Configuration Number 2 —Fan Out of TMS at Source

eescale S

emiconduct

, I

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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Motorola Command One User Manual Page 14